successfully able to run simple workflows

Signed-off-by: Casey Lee <cplee@nektos.com>

pkg/container/docker_logger.go

@@ -0,0 +1,117 @@
+package container
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/nektos/act/pkg/common"
+	"github.com/sirupsen/logrus"
+
+	"github.com/docker/docker/pkg/stdcopy"
+)
+
+type dockerMessage struct {
+	ID          string `json:"id"`
+	Stream      string `json:"stream"`
+	Error       string `json:"error"`
+	ErrorDetail struct {
+		Message string
+	}
+	Status   string `json:"status"`
+	Progress string `json:"progress"`
+}
+
+func logDockerOutput(ctx context.Context, dockerResponse io.Reader) {
+	logger := common.Logger(ctx)
+	if entry, ok := logger.(*logrus.Entry); ok {
+		w := entry.Writer()
+		_, err := stdcopy.StdCopy(w, w, dockerResponse)
+		if err != nil {
+			logrus.Error(err)
+		}
+	} else if lgr, ok := logger.(*logrus.Logger); ok {
+		w := lgr.Writer()
+		_, err := stdcopy.StdCopy(w, w, dockerResponse)
+		if err != nil {
+			logrus.Error(err)
+		}
+	} else {
+		logrus.Errorf("Unable to get writer from logger (type=%T)", logger)
+	}
+}
+
+func streamDockerOutput(ctx context.Context, dockerResponse io.Reader) {
+	out := os.Stdout
+	go func() {
+		<-ctx.Done()
+		fmt.Println()
+	}()
+
+	_, err := io.Copy(out, dockerResponse)
+	if err != nil {
+		logrus.Error(err)
+	}
+}
+
+func logDockerResponse(logger logrus.FieldLogger, dockerResponse io.ReadCloser, isError bool) error {
+	if dockerResponse == nil {
+		return nil
+	}
+	defer dockerResponse.Close()
+
+	scanner := bufio.NewScanner(dockerResponse)
+	msg := dockerMessage{}
+
+	for scanner.Scan() {
+		line := scanner.Bytes()
+
+		msg.ID = ""
+		msg.Stream = ""
+		msg.Error = ""
+		msg.ErrorDetail.Message = ""
+		msg.Status = ""
+		msg.Progress = ""
+
+		if err := json.Unmarshal(line, &msg); err != nil {
+			writeLog(logger, false, "Unable to unmarshal line [%s] ==> %v", string(line), err)
+			continue
+		}
+
+		if msg.Error != "" {
+			writeLog(logger, isError, "%s", msg.Error)
+			return errors.New(msg.Error)
+		}
+
+		if msg.ErrorDetail.Message != "" {
+			writeLog(logger, isError, "%s", msg.ErrorDetail.Message)
+			return errors.New(msg.Error)
+		}
+
+		if msg.Status != "" {
+			if msg.Progress != "" {
+				writeLog(logger, isError, "%s :: %s :: %s\n", msg.Status, msg.ID, msg.Progress)
+			} else {
+				writeLog(logger, isError, "%s :: %s\n", msg.Status, msg.ID)
+			}
+		} else if msg.Stream != "" {
+			writeLog(logger, isError, msg.Stream)
+		} else {
+			writeLog(logger, false, "Unable to handle line: %s", string(line))
+		}
+	}
+
+	return nil
+}
+
+func writeLog(logger logrus.FieldLogger, isError bool, format string, args ...interface{}) {
+	if isError {
+		logger.Errorf(format, args...)
+	} else {
+		logger.Debugf(format, args...)
+	}
+}